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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f9ac25fcc24fc6b4c4665fdf4a5eb69c6e85b714965ebc7938fbf6b011c1e2' 
  AND token = 'x/kDz5QOheAEnawiBMbrAlYOZwQYqarplZlIe1EwIgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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