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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b899e9e4e195179e0cadc5f1d3fa716309cd67065f34b45d7bed355c11858d' 
  AND token = 'mxA06DBJSMLnkm+M7BDYZyY/zXBD8R05bAGPpSBj7uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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