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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71bd141fd10146cf3f864696a1b02414175323c4a8fe2076ff53eb07e02dd84' 
  AND token = 'si2hNFRjzxX4uB5ihuGAh88nOEV1nbD2hI364Lfi/cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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