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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f5b308cb8f3cdb7caead830df1a0a2201b6b2a9ba30560adf40e9b3ae77bfc' 
  AND token = 't8vU6mhk7VEXNVIFVElgcqfa6WCnLBpSZrgWLlvHx1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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