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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa1e6f15f9eefc2c825cf855fccee0efd3f63710a9282f1b5c9c0a3221327ed' 
  AND token = 'PxLEYaC6+Ld2Psgfz66ji3GR4hOFPHLWxSOTpsmeVUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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