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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6f2ce800e2445b27f438408e3040e12dc750d3d50a043d9d4fadd06b422ed5' 
  AND token = '1eIuVE2+MTECX8o4VvmpCiRS3dwYCsaUCIMD+XzkdBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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