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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc180c3819156cc908b45176f335645f2e9638f07589686a2240c6ba33b6943' 
  AND token = 'VobbdSHY3UDDLHpeNoE5G14/4qbfluDV0NiXPMMc4rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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