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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67481075423fecf7c5e30e377d037e2abce794d0f3a9a6db0d4381704ac3402' 
  AND token = 'uw1EHmwr2anR3blW1T5rwuhga3z1rYLFVF5KKMCLJa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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