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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d14f73ef9884b4c5997ad1dc123477f0d8a08d62dd97351fcad755d0df15ea' 
  AND token = 'WSCtM7Usq2exloaKbYlq1B36s0MvxiQTOlHnlQRRMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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