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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f363c1561e12f9d7d934e69f6275638713da61c16993275b26beb8131d2b13ff' 
  AND token = 'Fyhc4fV+qtp/YaCjb6dJ7//cDypy5/REgNEywP2LNS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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