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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f22631ac1669facca8df13c3118e93a75a6c5366541e611f90c3d3d2c67f0d2' 
  AND token = '2z3gvAGiWlepov0rQcR5PQ/wxHwpVPMArhNsFa5MvuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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