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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cb1fedb54a9aa488bcf42d738a6b7b9010615ea07cf27d0db361d27467c5d8' 
  AND token = 'EPyXy+nFp4U3POa2vnNAvncZQZluWd7zr9v5edV5BlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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