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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a5f1c69922b092c3e56b464eaebeb8f5560d80229b61a7a24a6edf16dc9c62' 
  AND token = 'cPRgY39vtQ8iNkEu4D5k5B9NiL5+sxJIFGvMp6VI65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}