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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8929585c551b88a67432575bc501448cd951abaa996fe5c6e1c4c1c17b261941' 
  AND token = 'ycDVfF2ggGgpuXhRD5Uz1uITzpkAL92OT9yunyPsArs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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