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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02110acf53f5fea68ab9f45fac9d22e70543b16a0d7022f4a1d166d193805ab9' 
  AND token = 'CneUZLKsSvrCJ7LoFrASJC3ANscpuiH6KsvDaDo1laY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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