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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc6318e38a892a668e8c25cd6506ab7024943966276de11c9fce8aa97036402' 
  AND token = 'BRboi5pt7XL3DKTZ6ZnBUNcR1Ulixu2kw//KaMXmwjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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