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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefd186725fad4b23abd5a888f89b4b60810e2a1ae05b40ac738638532487e38' 
  AND token = 'qqQfZ0QwioMzn0udr35TyykCeujSFh8Eu2aWwPHYVBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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