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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a704e8bee7a4989ef6c8ed0423999b175f196b130302de1dc0719e640d54fa4b' 
  AND token = '3GsVIf+beguD+FzgVnK42bLM+bXNbbjfEz1MgwVVSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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