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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4956d060b68125ceb5004435180312851f36c95b3289793b7ea7f4e6668ab93b' 
  AND token = '739dMk6jImBz1L1i/pPD7pwLXwgm/Zo5QL33ikg2zd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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