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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc91f38101e2d3f6031884ab31ee77d622e4202015be33652029b5a7aa875fb' 
  AND token = 'sRoRRj3J+9NsmTDi7SFTpaAzINYVGo8B82H/hfBL3tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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