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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869612c89954f033587612dc1d1701e6c7e5b13fadd8318765039343713d9832' 
  AND token = 'Eklnrbw18xMHqFrfWMcVW9wuBPoPrMLclN/V184G7ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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