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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6155f12c923bcff1c05cee48a24fd6d00aa7c216d417046ee84928c68869324a' 
  AND token = '6fCahMvt3YxHX1Jbsi4To8dqp5/zO8U1xO+34hfHPqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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