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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd699d6d14c18f2fb94977e5b4338262fc704d54b7e01f07254c158b3221fda47' 
  AND token = '35E1Gv4MX1D50yvMsD3PA+yNwW/82dhyo9chHgMsxQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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