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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2797fc92c9c42fb014ca5df63ae47541dcc8f0c6e4fad0f279b752aabd587aa8' 
  AND token = 'V86FDyjhunO2zOslrx9za4tbRdWtjvIF5SRuSSoNbyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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