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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96949bb0bea8849ecb698b0d1c837c8bd3f19bb4f36e5bb095961927e90de8b3' 
  AND token = 'WdV3j6RfXhMZGw54FeXmt7WIDVu2VgasMgM0aKH0Rlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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