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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92f1cec62340dcf159e8c5046d5946e26b285f0ecaebe10b034fe750feb6183' 
  AND token = 'Q1yD3qVXlQKr88QOmuDGhfz1p0ZBvxkdB5x4pObO59M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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