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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c209c388a71d69ae43bc08ecd4f5365d3bab98197bc143aa9548982d6e3782e' 
  AND token = 'R6p55L3PksUHzK5x+EPQ6sR5sTNiXcn3tkGPVpUiq5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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