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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3222c6c3cebef0876e2f9e35b8044adaa4966e82ffff22823252da9f78bac729' 
  AND token = 'rLBtDLO15gMZmyt34KXc67ualkwjatKknvm2B3JPThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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