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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a9ab2edb7cfa95b00e9260a76a1357e2cc1654ff385f4e442bb002f65f8632' 
  AND token = 'oi9/J/tErNyXmrZPSascS297UCTGBac4VXMSGwxn9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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