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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8db3d410e66e12a63a94fa56aafd8a89f6eea64450eb36c462d397209dc75e' 
  AND token = 'BVAaEIIdNuNS3PO+r6KAcu6NFjL82TXj3/+1FhG75YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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