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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4fea17cd132933e2aaab9cc2063acfa189f5748d6ecb782380ecb8c191428d' 
  AND token = 'fF7Sjo58H7StDTjliRDizdyN3ouIkRL+mZyTRSPceF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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