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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6504b6baca7bf4e5d5b803a7dd7dd15a2b966914544122463589907b4f50eb' 
  AND token = 'Ck7d4IxqGtz7QHV3IHzgeQ2uwolS9XGBlNGn3kRvj2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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