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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c39cc95ceb938ba6f407fcbf810e1880aadd2ebe94f64468cb398a2c712ee2' 
  AND token = 'sTX3pCsrgcZzA7DspM4kOyQvz7QewJr+6GhY5cYVNxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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