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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dfd6e40b7ebe0dd8b1e5dcfd0dd6e209e4ceedb74eb9dd9fb503b0fb9908c5' 
  AND token = 'CMxmte+1P2RTCECCoquG1Hwr2OG+jx3qBxwBYZ7Gn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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