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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846056ff62e6f5f750012d9ab1c0832ed7b4baca1ea76bac92a0431aed9c406f' 
  AND token = 'Lnjw359V0goUjCtdk53kV4BwHSf0rrq9VkJsDhSe8B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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