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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec4a41bbdb68d9fde673d5f915d1a5b77e06423d6cb0eb740e0513b6bbeef01' 
  AND token = 's5tKbRxdH2S+X5Mx6EVrRHR5Fguc6XTfPebY4XC4b4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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