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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544129f71f18197367c2de8528571f56859fa23e794d95762dd9e155b146e087' 
  AND token = 'V2Rd0ekmKKtPfK1nQlQc4A5Jk9lpYf7IZbn/BkRRHjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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