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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92cd0df53283a571bf38c07ac4141d264bd32624ef5be7766cf4a2977eb6e1d' 
  AND token = 'a3YtG/d5Lq66Et6B5zw6mzEQ+DeL7F90GWAlkt40y3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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