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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db615335c53d7e90811acef8269f4879af1893f7662de060233ecb668fb0844b' 
  AND token = '33dBsWP28lDPKUQCWpW2mEVYDDLBc+iy73U7c9fVELY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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