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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0accbb7e1d8216e26d54743bce94b33cc01245ed83e040f2c20abac5a59fe07' 
  AND token = 'XcbCm2fTnHQ8yCYexuBn71kUM2An+4YJxdKtxMKedWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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