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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04991281183695d1ca2085bb4982fd0557856e7e6b0f079ac11f153372835c6' 
  AND token = 'dy8CNJOsg3hLpJmI/fadld6dfiF8KTz1mZV7eNnHEVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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