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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e2a4f04758aadeeb150e1c0d423e552a6b04109afeaec68e816e257e0877cc' 
  AND token = 'IfPNI5gpYaQAkxhSQHsl6RUK2NYFsykxZ6QmOIa5AGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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