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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3284fe7aaf5fb1980df7e7c6e1de5d7e4ddd3d1995f9a31aa2543467a76a9db9' 
  AND token = 'JqFAzUiGLJiVWsDywuLaskPqMbbdek+OHaemWekj7Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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