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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df067f87e00e63baf014af3fa60a18f0880ba43290271334977427b59854b40e' 
  AND token = 'Cqp4fR0EMgvjuQ8Lw/p+LedMnNg3ty4EpJh0gQP+fjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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