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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719699045f8a7fce9221f1a1c09b0034bc32b309d23a5d55c4d972efe37056ef' 
  AND token = 'zlmiOhoplgmvX1HVfIsOZ7YetyEP9Q4k8m/c84oh1DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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