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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270159ca4f9f325437b09aac3955118c23379a4dcec2dc38fa4cdb8d815c8fa2' 
  AND token = 'KCR5SClvxO3tqu9ghM19LDl2czhs8K3ZyWpNzRyDe+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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