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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3067f7d3047486851cafdf2deca6ce4db38ceb884d7df7d2c496218b0f6a56' 
  AND token = '9758zAo7SjJ7rAXkV3EcDSMeOB4y02MY6On+NOChWOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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