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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aded0545c2f2e38da2a18e5e6d47fa640c3bbd40aec97e6c5fe1f33bd5a4053b' 
  AND token = '8n+OKn+tlc+KZroy/vKNSRBrnnRSh25uJJj9ey5VMVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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