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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7e32f4a19c05dc3940914a109fc8c3fd89a092bc389d6936c7c7309f3777e2' 
  AND token = 'H7nSODLpqSb5GhMgNAk9eF/37/8HsTvMrGSAmZ3Rr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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