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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5996c35c360ddb391aa6d43fac55faa3481c28824bcd887f2f6b0c2333e6a1ae' 
  AND token = 'WW4Eku7J7sLuU3mnpRPxCrQcgqx6TD6JetVZ7QLARJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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