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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ab4993ac4a9ed14de89f6ba10375a7c20cd175cfd359b3b3eff8194a86588a' 
  AND token = 'rOe3YtWXTOAQBHBM4KSasrgkwd3TKyAyUzIugUf1jXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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