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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe149efb7bdba82b286d1dd3571b19b309642a37cd283d264cfc2c187b11ccb' 
  AND token = '4QfCynh8kTgq0JbAjtqsp5hNDF5CG+VAfRavS5FspFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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