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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a27f0f0e9fb111245b82348fbc218d5c2136cd1de24f011dc4760263b85130' 
  AND token = 'LIza0YxtamYN+Vcs7/kTJCipvKUJ+ydEWAer1OHDdZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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