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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73adcfb71be5905457bfab43c06e13696f338bbce404b372a5e0e9f81f89e6ba' 
  AND token = 'r8tIR0g/2OB0UenZO+aWhUAZATuf5CHc50jVx/Hf8zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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