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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0747cba9419ef413ddf9a1a22e21ad4729dd561bb4682df751a3e87a1290f848' 
  AND token = 'CbUx8ZSuzVMmfi9UeL0DQOOczwSzD2+UIpzuYgXcqW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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