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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3f916ef62f0cc7da884de084e0b4a45953215519c1032113cad06b23354dbf' 
  AND token = 'WD19bopJnNFlJNYFCmrcJyMU//d1R2QwuHJFftR+rm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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