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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bec05e4a99d39d4b72079ed03dde3dbcbc60405ec3613b73a38d648cc3ff95' 
  AND token = 'Q4BmCZTp7L1zLtUKprh+zejTZC6xeDAi3BPUQYvNMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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