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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159ffacdcbb08fee1d0b7b4e1e6a0d2539f3a4c410fe49c59391733a2ef101c3' 
  AND token = 'Yw5cp3kgx6X2LkIKACTTaeK+AL/7aGFV2rgttRcRLVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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